The Doppler effect

1 mark · Easy

Which change will a person hear as a sound source moves towards them?

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Correct option: A higher-pitched sound

Common mistakes: A lower-pitched sound; No change in sound

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct option selected: A higher-pitched sound.

Worked solution

As a source approaches, the waves are compressed so frequency increases and pitch is higher.